If velocity is doubled, by what factor does the lift term increase, assuming other factors constant?

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Study for the Principles of Flight Test. Learn with flashcards and multiple-choice questions, each question includes hints and explanations. Prepare for your exam with confidence!

Multiple Choice

If velocity is doubled, by what factor does the lift term increase, assuming other factors constant?

Explanation:
Lift is tied to dynamic pressure, which is ½ ρ V^2, and the lift equation is L = ½ ρ V^2 S CL. If the velocity doubles while air density, wing area, and the lift coefficient stay the same, the V^2 term becomes (2V)^2 = 4V^2. This makes lift four times larger. In short, with all other factors unchanged, doubling speed increases lift by a factor of four. If any of those other factors change (like CL or density), the result would differ.

Lift is tied to dynamic pressure, which is ½ ρ V^2, and the lift equation is L = ½ ρ V^2 S CL. If the velocity doubles while air density, wing area, and the lift coefficient stay the same, the V^2 term becomes (2V)^2 = 4V^2. This makes lift four times larger. In short, with all other factors unchanged, doubling speed increases lift by a factor of four. If any of those other factors change (like CL or density), the result would differ.

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